well man i think a all motor 1.5l is pretty dope so if i were you I would get a d16z6 or d16y8 head. so go find a D16z6 or y8 head. complete with intake manifold, throtle body, all sensors, distributor, and what not. Then do an MPFI swap, if you get a y8 manifold sell the dizzy or trade for an OBD0 or OBD1 dizzy and then decide what OBD you are going to run, 0 or 1. it is a fairly cheap swap to do it will just take a lot of wiring work. people will claim it is a lot, and in a way it is, but it is not that hard, or it is not as hard as everyone claims it is.
good luck...